pAtient rePorted Outcomes Linked With histoLogy in Patients With uLcerative cOlitis

After informed consent, patients will undergo endoscopic assessment evaluating endoscopic disease activity using established scoring systems

• Mayo endoscopic sub-score5
• Ulcerative Colitis Endoscopic Index of Severity [UCEIS]6 All endoscopic assessments will be recorded, allowing blinded scoring by independent endoscopists afterwards. Study protocol APOLLO - 2 During endoscopy, colonic biopsies will be taken according to standard of care from the most inflamed area of the colon and normal area if applicable, 0-60cm from the anal verge. All biopsies will be scored histologically using the Nancy Index.7 During the same study visit, clinical symptoms (Simple clinical colitis activity index [SCCAI]) and patient reported outcomes (PROMs) will be evaluated digitally using validated scoring systems8
• IBD disk
• PRO-2
• Visual Analogue Scale
• IBD control in case of non-remission Finally, patients will be biochemically (C-reactive protein, hemoglobin, albumin) evaluated, including measurement of drug level (infliximab, adalimumab, vedolizumab) in case of ongoing exposure to biological agents. All evaluations are part of standard-of-care. Definitions
• Endoscopic remission: Mayo endoscopic sub-score 0 AND UCEIS 0
• Endoscopic response according to

• Mayo score: decrease in Mayo endoscopic sub-score ≥ 1
• UCEIS: decrease in UCEIS ≥ 2
• Endoscopic improvement: Mayo endoscopic sub-score 1
• Histological remission: Nancy histological index 0
• Absence of active/acute histological inflammation: Nancy histological index 0-1
• Histological response: Nancy histological index > 1
• PRO2 remission: stool frequency ≤ 1 (absolute stool frequency ≤ 3 OR 1-2 stools more than usual) AND rectal bleeding score of 0 (average of 3 days prior to endoscopy)
• IBD disk remission per item:

• Abdominal pain
• Regulating defecation
• Interpersonal interactions
• Education and work
• Sleep
• Energy
• Emotions
• Body Image
• Sexual function
• Joint pain

Inclusion criteria

All patients with ulcerative colitis (≥ 16 years) undergoing planned endoscopic assessment as part of standard of care between 01.07.2020 and 30.06.2021. Evidence of a personally signed and dated informed consent document (ICF) indicating that the subject has been informed of all aspects of the study.

Exclusion criteria

Subjects with a diagnosis of indeterminate colitis, ischemic colitis, radiation colitis, diverticular disease associated with colitis, microscopic colitis or Crohn's disease.

Subjects with clinical findings suggestive of CD (e.g. fistulae, granulomas on biopsy) are also excluded. Similar data collection within 8 weeks prior to endoscopic assessment